Home / 20,979.01-28,950.66-11,418.56

Finding the Fourth Proportional to 20,979.01, 28,950.66 and 11,418.56

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Solution

The fourth proportional to 20,979.01, 28,950.66 and 11,418.56 is: 15,757.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.01 : 28,950.66 = 11,418.56 : x
  2. Step 2: Convert to fraction form
    20,979.01/28,950.66 = 11,418.56/x
  3. Step 3: Cross multiply
    20,979.01x = 28,950.66 × 11,418.56
  4. Step 4: Simplify right side
    20,979.01x = 330,574,848.25
  5. Step 5: Solve for x
    x = 330,574,848.25/20,979.01
  6. Step 6: Final answer
    x = 15,757.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.